add flake with direnv support

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,2 +1,3 @@
 target/
 .ccls-cache/
+.direnv/

flake.lock

@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1707824078,
+        "narHash": "sha256-Au3wLi2d06bU7TDvahP2jIEeKwmjAxKHqi8l2uiBkGA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "99d7b32e4cfdaf763d9335b4d9ecf4415cbdc405",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,35 @@
+{
+    description = "modular fetch";
+
+    inputs = {
+        nixpkgs.url = "github:NixOS/nixpkgs";
+    };
+
+    outputs = {
+        nixpkgs,
+        ...
+    }: let 
+        systems = [ "x86_64-linux" "aarch64-linux" ];
+        forEachSystem = nixpkgs.lib.genAttrs systems;
+        pkgsForEach = nixpkgs.legacyPackages;
+    in {
+        devShells = forEachSystem (system: 
+            let 
+                pkgs = pkgsForEach.${system};
+            in {
+                default = pkgs.mkShell {
+                    name = "modfetch";
+
+                    nativeBuildInputs = with pkgs; [
+                        gcc
+                        gnumake
+                    ];
+
+                    buildInputs = with pkgs; [
+                        curl.dev
+                    ];
+                };
+            }
+        );
+    };
+}